Metallic pencil



July 15, 1924. 1,501,745

F. CARROLL METALLI C PENC IL Filed Sept. 27 1923 IN VE N TOR FRANCIS CAR EOL L WITNESSES citizen of the United Patented July 15, 1924.

UNITED STATESPATENT OFFICE.

FRANCIS CARROLL, OI YONKEBB, NEW YQRK.

METALLIC PENCIL Application filed September 27, 1923. Serial No. 865,209.

To all whom it may concern:

Be it known that I, FRANCIS CARROLL, a States of America, and a resident of Yonkers, in the county of Westchester and State of New York, have invented a new and Improved Metallic Penoil, of which the following is a descri tion.

My invention relates to a pencil an particularly to a metallic pencil.

The general object of my invention is to provide a pencil of lead alloy having the characteristic that distinct and clear writing may be produced therewith and which pencil at the same time will possess the attribute'of being readily sharpened by scrapin or abrading.

eference is to be had to the accompanying drawing forming a part of this specification, in which the elevation of a pencil.-

In carrying out my invention in accordance with the illustrated example, a pencil 10 is formed wholly of allO composed of lead, zinc and mercury combined approximately in the proportions of lead, 70 to 80%; zinc, 12 to 22%; mercury, 8 to 18%. The hard and soft grades of pencils are produced by varyin the mercury content.

The method 0% manufacture is briefly as follows: The lead and the zinc are first alloyed by melting them and the mercury is then added, care being taken that the temperature of the lead and zinc does not ex ceed the boiling point of mercury 357 Cent.

figure shows a side The mixture is then poured into molds which are shaped to produce the pencil. When cold the pencils are removed from the molds and the ends threaded to take the rubber tips. It will be readily understood that may be produced by extrusion, that 1s to sa by forcing the material through hydraulic lead presses as in the manufacture of lead pipe and the extruded material cut into the desired lengths.

The pencil in practice advantageously is provided with a piece of rubber llat the end secured to the threaded rear end of the pencil. v

A proper point 12 may be produced on 60 the pencil by scraping the material of the pencil with a knife blade or by the use of suitable abrading material.

A pencil, formed as described, is unbreakable and can be manufactured more easily than the ordinary lead pencil.

Having thus described my invention, I claim 1. As a new article of manufacture, a writing pencil formed. of a. lead alloy containing mercury determining the degree of hardness of the pencil.

2. As a new article of manufacture, cil formedof lead to zinc, 22%; and mercury, 8 to 18%.

3. As a new" article of manufacture, a pencil composed of lead, zinc and mercury.

FRANCIS CARROLL.

a pen 12 to in manufacturing in large quantities, pencils 40' 

